linux-kernel - [PATCH -next] hwrng: core - Use DEVICE_ATTR

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Date:   Thu, 20 May 2021 21:57:13 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <mpm@...enic.com>, <herbert@...dor.apana.org.au>,
        <yuehaibing@...wei.com>
CC:     <linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH -next] hwrng: core - Use DEVICE_ATTR_<RW|RO> macro

Use DEVICE_ATTR_RW()/DEVICE_ATTR_RO() helper instead of
plain DEVICE_ATTR, which makes the code a bit shorter and
easier to read.

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 drivers/char/hw_random/core.c | 36 +++++++++++++++--------------------
 1 file changed, 15 insertions(+), 21 deletions(-)

diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index adb3c2bd7783..59beaf4d29bd 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -319,9 +319,9 @@ static int enable_best_rng(void)
 	return ret;
 }
 
-static ssize_t hwrng_attr_current_store(struct device *dev,
-					struct device_attribute *attr,
-					const char *buf, size_t len)
+static ssize_t rng_current_store(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t len)
 {
 	int err = -ENODEV;
 	struct hwrng *rng, *old_rng, *new_rng;
@@ -354,9 +354,9 @@ static ssize_t hwrng_attr_current_store(struct device *dev,
 	return err ? : len;
 }
 
-static ssize_t hwrng_attr_current_show(struct device *dev,
-				       struct device_attribute *attr,
-				       char *buf)
+static ssize_t rng_current_show(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
 {
 	ssize_t ret;
 	struct hwrng *rng;
@@ -371,9 +371,9 @@ static ssize_t hwrng_attr_current_show(struct device *dev,
 	return ret;
 }
 
-static ssize_t hwrng_attr_available_show(struct device *dev,
-					 struct device_attribute *attr,
-					 char *buf)
+static ssize_t rng_available_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
 {
 	int err;
 	struct hwrng *rng;
@@ -392,22 +392,16 @@ static ssize_t hwrng_attr_available_show(struct device *dev,
 	return strlen(buf);
 }
 
-static ssize_t hwrng_attr_selected_show(struct device *dev,
-					struct device_attribute *attr,
-					char *buf)
+static ssize_t rng_selected_show(struct device *dev,
+				 struct device_attribute *attr,
+				 char *buf)
 {
 	return sysfs_emit(buf, "%d\n", cur_rng_set_by_user);
 }
 
-static DEVICE_ATTR(rng_current, S_IRUGO | S_IWUSR,
-		   hwrng_attr_current_show,
-		   hwrng_attr_current_store);
-static DEVICE_ATTR(rng_available, S_IRUGO,
-		   hwrng_attr_available_show,
-		   NULL);
-static DEVICE_ATTR(rng_selected, S_IRUGO,
-		   hwrng_attr_selected_show,
-		   NULL);
+static DEVICE_ATTR_RW(rng_current);
+static DEVICE_ATTR_RO(rng_available);
+static DEVICE_ATTR_RO(rng_selected);
 
 static struct attribute *rng_dev_attrs[] = {
 	&dev_attr_rng_current.attr,
-- 
2.17.1